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Search: id:A136298
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| A136298 |
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a(n)=3a(n-1)-4a(n-3), n>3. |
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+0
2
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| 1, 2, 4, 9, 19, 41, 87, 185, 391, 825, 1735, 3641, 7623, 15929, 33223, 69177, 143815, 298553, 618951, 1281593, 2650567, 5475897, 11301319, 23301689, 48001479, 98799161, 203190727, 417566265, 857502151, 1759743545, 3608965575
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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O.g.f.: (1-x-2*x^2+x^3)/[(1+x)(-1+2*x)^2]. a(n)=7*2^n/9-(-1)^n/9+A001787(n+1)/12 if n>0. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 04 2008
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CROSSREFS
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Cf. A078039.
Adjacent sequences: A136295 A136296 A136297 this_sequence A136299 A136300 A136301
Sequence in context: A018100 A052908 A036616 this_sequence A122584 A142474 A141015
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KEYWORD
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nonn,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Mar 22 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 04 2008
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